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iommu/vt-d: Reserve a domain id for FL and PT modes

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Vt-d spec rev3.0 (section 6.2.3.1) requires that each pasid
entry for first-level or pass-through translation should be
programmed with a domain id different from those used for
second-level or nested translation. It is recommended that
software could use a same domain id for all first-only and
pass-through translations.

This reserves a domain id for first-level and pass-through
translations.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Cc: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2018-12-10 09:58:59 +08:00 committed by Joerg Roedel
parent 5d308fc1ec
commit 3b33d4ab32
2 changed files with 16 additions and 0 deletions
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10
drivers/iommu/intel-iommu.c
View File

@ -1621,6 +1621,16 @@ static int iommu_init_domains(struct intel_iommu *iommu)
*/
set_bit(0, iommu->domain_ids);
/*
* Vt-d spec rev3.0 (section 6.2.3.1) requires that each pasid
* entry for first-level or pass-through translation modes should
* be programmed with a domain id different from those used for
* second-level or nested translation. We reserve a domain id for
* this purpose.
*/
if (sm_supported(iommu))
set_bit(FLPT_DEFAULT_DID, iommu->domain_ids);
return 0;
}

6
drivers/iommu/intel-pasid.h
View File

@ -17,6 +17,12 @@
#define PDE_PFN_MASK PAGE_MASK
#define PASID_PDE_SHIFT 6
/*
* Domain ID reserved for pasid entries programmed for first-level
* only and pass-through transfer modes.
*/
#define FLPT_DEFAULT_DID 1
struct pasid_dir_entry {
u64 val;
};